The researchers found that the penises with a more pronounced “mushroom shape” - those that had a marked coronal ridge, where the head meets the shaft - fared better in the experiment. To establish this theory, Gallup’s team closely observed three differently shaped latex penises entering an artificial vagina filled with starch and water, used to represent semen. “It's called the semen displacement hypothesis.” “If a female has been inseminated by another male within a brief period of time, the next male in sequence has the opportunity to scoop out or displace the prior male’s semen from the female's reproductive tract, so he can substitute his semen for those of his rivals,” says Gallup. And the evolutionary problem that's posed by female infidelity is that males can be duped into caring for offspring other than their own,” says Gallup, who popularized the so-called semen displacement theory with a co-authored study, published in 2003 - a theory that has since been backed up by other experts, such as Todd Shackelford, Ph.D., chair of psychology at Oakland University in Michigan. “The mushroom configuration of the human penis evolved as an adaptation to female infidelity. This gives a new guy a better chance of getting a woman pregnant if she’s had sex with multiple partners in a short period of time. But why is the penis mushroom-shaped? Why does the tip make us think of shrooms? One leading theory is that the mushroom lookalike at the tip of the penis evolved because it’s a good shape for scooping out other men’s semen, says Gordon Gallup Ph.D., an evolutionary psychologist at the University at Albany in New York. Whether short or long, thick or thin, circumcised or not, penises tends to look a bit like everyone’s favorite fungi. Penises come in all shapes and sizes, but one thing most have in common is a toadstool-like head, scientifically known as the glans.
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